CN105577575A - Link control method and device - Google Patents
Link control method and device Download PDFInfo
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- CN105577575A CN105577575A CN201410567855.2A CN201410567855A CN105577575A CN 105577575 A CN105577575 A CN 105577575A CN 201410567855 A CN201410567855 A CN 201410567855A CN 105577575 A CN105577575 A CN 105577575A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/12—Avoiding congestion; Recovering from congestion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/12—Shortest path evaluation
- H04L45/125—Shortest path evaluation based on throughput or bandwidth
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/15—Interconnection of switching modules
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/15—Interconnection of switching modules
- H04L49/1515—Non-blocking multistage, e.g. Clos
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Abstract
The invention discloses a link control method and device. The method comprises that link information and/or machine frame information in a system is obtained; and link control is implemented according to the obtained link information and/or machine frame information. According to the technical schemes of the invention, the problems of local congestion and packet loss in the three-level asymmetric exchange system can be effectively solved, the flow level of the system is ensured, and the system performance is improved.
Description
Technical field
The present invention relates to packet data exchanged technical field, particularly relates to a kind of chainlink control method and device.
Background technology
Switching system is the key components of PSE, switching system is by exchanging access unit and crosspoint forms, exchange access unit exchanges access unit by source exchange access unit and object and forms, wherein, source exchanges access unit and packet is switched to cell, it is packet by cell reassemble that destination exchanges access unit, and crosspoint is responsible for the forwarding and the exchange that realize cell, has multiple exchange access unit and multiple crosspoint in General System.
Fig. 1 is a kind of three-level exchange system connection schematic diagram, as shown in Figure 1, this three-level exchange system has four service subrack and a center machine frame, four service subrack are respectively service subrack 1, service subrack 2, service subrack 3, service subrack 4, in Fig. 1, the crosspoint be positioned on service subrack is called operation exchange unit, and the crosspoint be positioned at above the machine frame of center is called center crosspoint; Exchange between access unit and operation exchange unit, between operation exchange unit and center crosspoint, be all interconnected by high speed serialization link.Exchange access unit exchanges access unit two parts by source exchange access unit and object and forms, wherein exchange access unit in source completes from external reception packet and switches to cell to send to crosspoint packet, and object exchanges access unit and pass to outside after crosspoint reception cell reassemble is packet.Operation exchange unit is made up of first order crosspoint and third level crosspoint, and wherein first order crosspoint realizes to exchange after access unit receives cell from source and is transmitted to center crosspoint; Third level crosspoint is transmitted to object crosspoint after center crosspoint receives cell.Because source exchanges access unit and object, to exchange access unit be all be positioned at exchange access unit, and therefore source exchange access unit and object exchange access unit has internal bus to share information; Same first order crosspoint and third level crosspoint are all be positioned at operation exchange unit, and therefore first order crosspoint and third level crosspoint have internal bus to share information.
Fig. 2 is a kind of three-level exchange system data flow diagram, as shown in Figure 2, according to the flow direction of data flow, exchange access unit from source and exchange access unit to object, the data flow exchanging access unit from service subrack 1 source exchange access unit to service subrack 2 object as shown in Figure 2, source on service subrack 1 exchanges the cell that access unit sends, first order crosspoint successively on service subrack 1 reaches center machine frame, crosspoint through center machine frame exchanges the third level crosspoint arrived on service subrack 2, the exchange of the third level crosspoint on service subrack 2, each object finally reached on service subrack 2 exchanges access unit.Crosspoint on the machine frame of usual center is called again second level crosspoint, namely has 3 grades of crosspoints in system.
Exchange between access unit and operation exchange unit, between operation exchange unit and center crosspoint, all interconnected by high speed serialization link, link 1 as shown in Figure 1, Figure 2 and link 2, these high-speed links are all two-way links, according to data flow, exchange access unit from source and exchange access unit to object.
Asymmetric switching system refers to, in crosspoint, access unit is exchanged for certain object, there is the situation that bandwidth is inconsistent, the inner long-term existence local congestion of crosspoint can be caused like this, cause whole net flow to decline, then likely cause packet loss when Congestion Level SPCC is serious, systematic function reduces.
Summary of the invention
In view of this, for solving the technical problem of existing existence, the embodiment of the present invention provides:
A kind of chainlink control method, is applied to three-level exchange system, comprises:
Link information in acquisition system and/or machine frame information;
According to link information and/or the machine frame information of described acquisition, carry out link control.
In one specific embodiment, for third level crosspoint,
Link information in described acquisition system and/or machine frame information, comprising:
Obtain the annexation of the input link of described third level crosspoint and the annexation of link rate and output link and link rate;
The described link information according to described acquisition and/or machine frame information, carry out link control, comprising:
Calculate current input tape width values K according to K=K+Ki, wherein, the link rate of the initial value of K to be 0, Ki be described third level crosspoint i-th input link, i=1,2 ..., n, n be the number of described third level crosspoint input link;
Judge whether the value of described K is not more than the total output bandwidth of described third level crosspoint, if, send to the second level crosspoint that described i-th input link is corresponding and can arrive object exchange access unit information, i=i+1, recalculate the value of K, continue to judge whether the value of described K is not more than the total output bandwidth of described third level crosspoint, so circulates; Otherwise, to i-th, the i-th+1 ..., and second level crosspoint corresponding to n-th input link send and can not arrive object and exchange access unit information, wherein, the output bandwidth that described third level crosspoint is total is the link rate sum of all output links of described third level crosspoint.
In one specific embodiment, for second level crosspoint,
Link information in described acquisition system and/or machine frame information, comprising:
Obtain the annexation of the input link of described second level crosspoint and link rate, output link annexation and link rate and there is the composition situation of link-attached service subrack with described second level crosspoint;
The described link information according to described acquisition and/or machine frame information, carry out link control, comprising:
The input tape width values Kt from source service subrack t is calculated according to Kt=Kt+Kti, wherein, the initial value of Kt is 0, Kti is the link rate of described second level crosspoint i-th from the input link of source service subrack t, i=1,2 ..., n, t=1,2 ..., m, n be the number of described second level crosspoint from the input link of source service subrack t, m is the number that there is link-attached source service subrack with described second level crosspoint;
Judge whether the value of described Kt is not more than the output bandwidth of described second level crosspoint to the service subrack at object crosspoint h place, if, the information that can arrive object exchange access unit h is sent from the first order crosspoint that the input link of source service subrack t is corresponding to described i-th, i=i+1, recalculate the value of Kt, continue to judge whether the value of described Kt is not more than the output bandwidth of described second level crosspoint to the service subrack at object crosspoint h place, so circulates, otherwise, to i-th, the i-th+1, and n-th sends the information that can not arrive object exchange access unit h from the first order crosspoint that the input link of source service subrack t is corresponding, after traveling through all input links from source service subrack t, t=t+1, i=1, recalculate the value of Kt, continue to judge whether the value of described Kt is not more than the output bandwidth of described second level crosspoint to the service subrack at object crosspoint h place, wherein, described second level crosspoint is the link rate sum of described second level crosspoint to all output links of object crosspoint h to the output bandwidth of the service subrack at object crosspoint h place,
Travel through after all and described second level crosspoint exists link-attached source service subrack, h=h+1, t=1, i=1, repeat above-mentioned steps, carry out link control.
In one specific embodiment, the described link information according to acquisition and/or machine frame information, carry out link control, comprising:
Adopt poll mode and/or when crosspoint output link breaks down, according to obtain link information and/or machine frame information, link control is carried out to described crosspoint.
The embodiment of the present invention also provides a kind of link data unit, is applied to three-level exchange system, comprising: acquisition module and link control module; Wherein,
Described acquisition module, for the link information in acquisition system and/or machine frame information;
Described link control module, for according to the link information of described acquisition and/or machine frame information, carries out link control.
In one specific embodiment, described link control module comprises the first calculating sub module, first and judges that submodule and first sends submodule; Wherein,
Described acquisition module, specifically for obtaining the annexation of input link of third level crosspoint and the annexation of link rate and output link and link rate;
Described first calculating sub module, for calculating current input tape width values K according to K=K+Ki, wherein, the initial value of K is 0, Ki is the link rate of described third level crosspoint i-th input link, i=1,2 ..., n, n be the number of described third level crosspoint input link; And the notice of submodule is sent according to first, redefine i=i+1, and recalculate the value of K;
Described first judges submodule, for judging whether the value of K that described first calculating sub module calculates is not more than the total output bandwidth of described third level crosspoint, the total output bandwidth of described third level crosspoint is the link rate sum of all output links of described third level crosspoint;
Described first sends submodule, for when first judges that submodule determines that the value of K is not more than the total output bandwidth of described third level crosspoint, send to the second level crosspoint that described i-th input link is corresponding and can arrive object exchange access unit information, afterwards, the first calculating sub module is notified; When first judges that submodule determines that the value of K is greater than the total output bandwidth of described third level crosspoint, to i-th, the i-th+1 ..., and second level crosspoint corresponding to n-th input link send and can not arrive object and exchange access unit information.
In one specific embodiment, described link control module comprises the second calculating sub module, second and judges that submodule and second sends submodule; Wherein,
Described acquisition module, specifically for obtain the annexation of the input link of second level crosspoint and link rate, output link annexation and link rate and there is the composition situation of link-attached service subrack with described second level crosspoint;
Described second calculating sub module, for calculating the input tape width values Kt from source service subrack t according to Kt=Kt+Kti, wherein, the initial value of Kt is 0, Kti is the link rate of described second level crosspoint i-th from the input link of source service subrack t, i=1,2 ..., n, t=1,2 ..., m, n is the number of described second level crosspoint from the input link of source service subrack t, and m is the number that there is link-attached source service subrack with described second level crosspoint; And send submodule second and to send to described i-th first order crosspoint corresponding from the input link of source service subrack t and can arrive after object exchanges the information of access unit h, i=i+1, recalculates the value of Kt; And after all input links from source service subrack t of traversal, t=t+1, i=1, recalculate the value of Kt; And after all and described second level crosspoint of traversal exists link-attached source service subrack, h=h+1, t=1, i=1, recalculate the value of Kt;
Described second judges submodule, for judging whether the value of the Kt that described second calculating sub module calculates is not more than the output bandwidth of described second level crosspoint to the service subrack at object crosspoint h place; Wherein, described second level crosspoint is the link rate sum of described second level crosspoint to all output links of object crosspoint h to the output bandwidth of the service subrack at object crosspoint h place;
Described second sends submodule, for when second judges that submodule determines that the value of Kt is not more than described second level crosspoint to the output bandwidth of the service subrack at object crosspoint h place, to send from the first order crosspoint that the input link of source service subrack t is corresponding to described i-th and can arrive the information that object exchanges access unit h; When second judges that submodule determines that the value of Kt is greater than described second level crosspoint to the output bandwidth of the service subrack at object crosspoint h place, to i-th, the i-th+1 ..., and n-th to send from first order crosspoint corresponding to the input link of source service subrack t and can not arrive the information that object exchanges access unit h.
In one specific embodiment, this device also comprises trigger module,
Described trigger module, for adopting the mode of poll and/or when crosspoint output link breaks down, trigger link control module carries out link control.
A kind of chainlink control method described in the embodiment of the present invention and device, the link information in acquisition system and/or machine frame information; According to link information and/or the machine frame information of described acquisition, carry out link control.Technical scheme according to the embodiment of the present invention, effectively can solve the local congestion in three grades of asymmetric switching systems and packet loss problem, ensure that the traffic level of system, improve the performance of system.
Accompanying drawing explanation
Fig. 1 is a kind of three-level exchange system connection schematic diagram;
Fig. 2 is a kind of three-level exchange system data flow diagram;
Fig. 3 is a kind of chainlink control method schematic flow sheet of the embodiment of the present invention;
Fig. 4 is another chainlink control method schematic flow sheet of the embodiment of the present invention;
Fig. 5 is another chainlink control method schematic flow sheet of the embodiment of the present invention;
Fig. 6 is a kind of link data unit structural representation of the embodiment of the present invention;
Fig. 7 is the structural representation of a kind of link control module 62 of the embodiment of the present invention;
Fig. 8 is the structural representation of another link control module 62 of the embodiment of the present invention;
Fig. 9 is another link data unit structural representation of the embodiment of the present invention;
Figure 10 is three grades of asymmetric switching system processing unit structural representations in the embodiment of the present invention 1;
Figure 11 is the asymmetric switching system structural representation of third level crosspoint in the embodiment of the present invention 2;
Figure 12 is crosspoint asymmetric scene schematic diagram in the second level in the embodiment of the present invention 3.
Embodiment
In order to solve local congestion in three grades of asymmetric switching systems and packet loss problem, embodiments provide a kind of chainlink control method, be applied to three-level exchange system, as shown in Figure 3, the method comprises:
Step 301: the link information in acquisition system and/or machine frame information;
It should be noted that, here, can the link information of all links and/or machine frame information in acquisition system, also only can obtain link information and/or the machine frame information of default part of links.
Step 302: according to link information and/or the machine frame information of described acquisition, carry out link control.
In one embodiment, for third level crosspoint, as shown in Figure 4, the method comprises:
Step 401: obtain the annexation of input link of third level crosspoint and the annexation of link rate and output link and link rate;
Step 402: calculate current input tape width values K according to K=K+Ki.
Wherein, the link rate of the initial value of K to be 0, Ki be described third level crosspoint i-th input link, i=1,2 ..., n, n be the number of described third level crosspoint input link.
Step 403: judge whether the value of described K is not more than the total output bandwidth of described third level crosspoint, if so, performs step 404; Otherwise perform step 405.
Here, the output bandwidth that described third level crosspoint is total is the link rate sum of all output links of described third level crosspoint.
Step 404: send to the second level crosspoint that described i-th input link is corresponding and can arrive object exchange access unit information, forward step 406 to.
Step 405: send to the second level crosspoint that i-th input link is corresponding and can not arrive object and exchange access unit information.
It should be noted that, this step with to i-th, the i-th+1 ..., and second level crosspoint corresponding to n-th input link send and can not arrive object to exchange access unit information be equivalent.
Step 406: judge whether all input links traveling through described third level crosspoint, if so, flow process terminates; Otherwise i=i+1, returns step 402.
It should be noted that, when carrying out link control, the overlay order of input bandwidth can be determined according to the order preset, and also can determine at random, can also determine etc. according to the order that link rate is descending or ascending.
In one embodiment, for second level crosspoint, as shown in Figure 5, the method comprises:
Step 501: obtain the annexation of the input link of described second level crosspoint and link rate, output link annexation and link rate and there is the composition situation of link-attached service subrack with described second level crosspoint;
Step 502: calculate the input tape width values Kt from source service subrack t according to Kt=Kt+Kti.
Here, wherein, the initial value of Kt is 0, Kti is the link rate of described second level crosspoint i-th from the input link of source service subrack t, i=1,2 ..., n, t=1,2 ..., m, n be the number of described second level crosspoint from the input link of source service subrack t, m is the number that there is link-attached source service subrack with described second level crosspoint.
Step 503: judge whether the value of described Kt is not more than the output bandwidth of described second level crosspoint to the service subrack at object crosspoint h place, if so, performs step 504; Otherwise, perform step 505.
Wherein, described second level crosspoint is the link rate sum of described second level crosspoint to all output links of object crosspoint h to the output bandwidth of the service subrack at object crosspoint h place.
Step 504: send the information that can arrive object exchange access unit h from the first order crosspoint that the input link of source service subrack t is corresponding to i-th, perform step 506.
Step 505: send the information that can not arrive object exchange access unit h from the first order crosspoint that the input link of source service subrack t is corresponding to i-th, perform step 506.
This step with to i-th, the i-th+1 ..., and n-th to send from first order crosspoint corresponding to the input link of source service subrack t and can not arrive the information equivalence that object exchanges access unit h.
Step 506: judge whether to travel through all input links from source service subrack t, if so, t=t+1, i=1, return step 502; Otherwise i=i+1, returns step 502.
Step 507: judge whether that all and described second level crosspoint of traversal exists link-attached source service subrack, if so, flow process terminates, otherwise t=t+1, i=1, return step 502.
Step 508: judge whether that traversal is all and there is link-attached object with this second level crosspoint and exchange access unit, if so, flow process terminates, otherwise h=h+1, t=1, i=1, return step 502.
Optionally, in one embodiment, the described link information according to acquisition and/or machine frame information, carry out link control, comprising:
Adopt poll mode and/or when crosspoint output link breaks down, according to obtain link information and/or machine frame information, link control is carried out to described crosspoint.
The embodiment of the present invention is mainly used in three grades of asymmetric switching systems in packet data exchanged, solves in three-level exchange system and there is asymmetric brought local congestion and bandwidth waste and packet loss problem, improve the performance of switching system.
The embodiment of the present invention also accordingly provides a kind of link data unit, is applied to three-level exchange system, and as shown in Figure 6, this device comprises: acquisition module 61 and link control module 62; Wherein,
Described acquisition module 61, for the link information in acquisition system and/or machine frame information;
Described link control module 62, for according to the link information of described acquisition and/or machine frame information, carries out link control.
In one embodiment, as shown in Figure 7, described link control module 62 comprises the first calculating sub module 521, first and judges that submodule 622 and first sends submodule 623; Wherein,
Described acquisition module 61, specifically for obtaining the annexation of input link of third level crosspoint and the annexation of link rate and output link and link rate;
Described first calculating sub module 621, for calculating current input tape width values K according to K=K+Ki, wherein, the initial value of K is 0, Ki is the link rate of described third level crosspoint i-th input link, i=1,2 ..., n, n be the number of described third level crosspoint input link; And the notice of submodule is sent according to first, redefine i=i+1, and recalculate the value of K;
Described first judges submodule 622, for judging whether the value of K that described first calculating sub module 621 calculates is not more than the total output bandwidth of described third level crosspoint, the total output bandwidth of described third level crosspoint is the link rate sum of all output links of described third level crosspoint;
Described first sends submodule 623, for when first judges that submodule 622 determines that the value of K is not more than the total output bandwidth of described third level crosspoint, send to the second level crosspoint that described i-th input link is corresponding and can arrive object exchange access unit information, afterwards, the first calculating sub module is notified; When first judges that submodule 622 determines that the value of K is greater than the total output bandwidth of described third level crosspoint, to i-th, the i-th+1 ..., and second level crosspoint corresponding to n-th input link send and can not arrive object and exchange access unit information.
In one embodiment, as shown in Figure 8, described link control module comprise the second calculating sub module 621 ', second judge submodule 622 ' and second send submodule 623 '; Wherein,
Described acquisition module 61, specifically for obtain the annexation of the input link of second level crosspoint and link rate, output link annexation and link rate and there is the composition situation of link-attached service subrack with described second level crosspoint;
Described second calculating sub module 621 ', for calculating the input tape width values Kt from source service subrack t according to Kt=Kt+Kti, wherein, the initial value of Kt is 0, Kti is the link rate of described second level crosspoint i-th from the input link of source service subrack t, i=1,2 ..., n, t=1,2 ..., m, n is the number of described second level crosspoint from the input link of source service subrack t, and m is the number that there is link-attached source service subrack with described second level crosspoint; And send submodule second and to send to described i-th first order crosspoint corresponding from the input link of source service subrack t and can arrive after object exchanges the information of access unit h, i=i+1, recalculates the value of Kt; And after all input links from source service subrack t of traversal, t=t+1, i=1, recalculate the value of Kt; And after all and described second level crosspoint of traversal exists link-attached source service subrack, h=h+1, t=1, i=1, recalculate the value of Kt;
Described second judges submodule 622 ', for judging whether the value of the Kt that described second calculating sub module calculates is not more than the output bandwidth of described second level crosspoint to the service subrack at object crosspoint h place; Wherein, described second level crosspoint is the link rate sum of described second level crosspoint to all output links of object crosspoint h to the output bandwidth of the service subrack at object crosspoint h place;
Described second sends submodule 623 ', for when second judges that submodule 622 ' determines that the value of Kt is not more than described second level crosspoint to the output bandwidth of the service subrack at object crosspoint h place, to send from the first order crosspoint that the input link of source service subrack t is corresponding to described i-th and can arrive the information that object exchanges access unit h; When second judges that submodule 622 ' determines that the value of Kt is greater than described second level crosspoint to the output bandwidth of the service subrack at object crosspoint h place, to i-th, the i-th+1 ..., and n-th to send from first order crosspoint corresponding to the input link of source service subrack t and can not arrive the information that object exchanges access unit h.
In one embodiment, as shown in Figure 9, this device also comprises trigger module 63,
Described trigger module 63, for adopting the mode of poll and/or when crosspoint output link breaks down, trigger link control module 62 carries out link control.
Below by specific embodiment, technical scheme of the present invention is described in further detail.
Embodiment 1
The embodiment of the present invention solves the asymmetric problem of the second level and third level crosspoint by the mode of classification process.Asymmetric for the third level crosspoint in service subrack, access unit is exchanged for each object, can not information be arrived by sending, ensureing that the mode being less than or equal to its total output bandwidth in total input bandwidth of current crosspoint input link realizes; And for center machine frame second level crosspoint asymmetric, then all service subrack are considered as an entirety, exchange access unit for each object, ensure that the input bandwidth of each source service subrack is less than or equal to the output bandwidth that object exchanges access unit.
In order to complete above-mentioned processing procedure, embodiments provide a set of three grades of asymmetric switching system processing unit, as shown in Figure 10.This device comprises memory module (wherein storing to transmit and a machine frame table), (corresponding above-mentioned first judges that submodule 622 and first sends submodule 623 for topology information detection module (corresponding above-mentioned acquisition module 61), an output bandwidth computing module (corresponding above-mentioned first calculating sub module 621 and/or the second calculating sub module 621 ') and a routing iinformation sending module, and/or second judges that submodule 622 ' and second sends submodule 623 ').
For the asymmetric process of the third level crosspoint of service subrack, topology information detection module is used for inquiry and transmits, and obtains its input and output link annexation and quantity;
Output bandwidth computing module, the link rate of the annexation obtained according to tabling look-up and each bar link, calculates the output bandwidth that this crosspoint is total;
Routing iinformation sending module, according to input link and link rate, to each bar input link, the input bandwidth of accumulation calculating crosspoint successively, when inputting bandwidth and being less than or equal to total output bandwidth, send to the corresponding output link of current input link and can arrive object exchange access unit information; When input tape is wider than output bandwidth, sends to the corresponding output link of current input link and can not arrive object exchange access unit information.
For the second level crosspoint on the machine frame of center, equally, topology information detection module is used for reading and transmits and machine frame table, obtains annexation and the quantity of input link and output link;
Output bandwidth computing module, transmits the link rate of annexation and each bar link obtained with machine frame table according to inquiry, calculate this crosspoint exchanges access unit place machine frame output bandwidth to this object;
Routing iinformation sending module, be used for for each source service subrack, the annexation obtained according to tabling look-up and the link rate of each bar link, the bandwidth of each bar input link is added up successively, and compare with output bandwidth, link transmission input bandwidth being less than or equal to output bandwidth can arrive corresponding object exchange access unit information; Link transmission input tape being wider than to output bandwidth can not arrive corresponding object exchange access unit information.
Embodiment 2
The present embodiment controls to be illustrated to the link based on third level crosspoint.
Figure 11 shows that the asymmetric switching system structural representation of third level crosspoint in the embodiment of the present invention 2, as shown in figure 11, system comprises 4 service subrack 1,2,3 and 4, a center machine frame.Each service subrack there are two sources exchange access unit, object exchanges access unit and 2 first order, third level crosspoints, center machine frame has two second level crosspoints.Realize in use-case at this, only list the flow arriving service subrack 3, service subrack 4 from service subrack 1, service subrack 2 through Central switching frame.
In each service subrack, exchanging between access unit and operation exchange unit respectively has two links to be connected respectively, also two links are respectively had to be connected between second level crosspoint on operation exchange unit and center machine frame respectively, the 3rd crosspoint 4# now on service subrack 2 and object exchange between access unit 3# has one article of link to disconnect (as shown in figure 11), so now switching system occurs that third level crosspoint is asymmetric, on service subrack 2, access unit 3# is exchanged for object, the input tape of third level crosspoint 4# is wider than output bandwidth, local congestion may be produced herein, thus influential system performance.
What now occur is that third level crosspoint is asymmetric, and its processing mode is as follows:
Step 001: on the third level crosspoint 4# on service subrack 2, first read by topology detection module and transmit, index in transmitting is that object exchanges access unit, content is then to arrive link number and this link rate (i.e. bandwidth) that this object exchanges access unit, therefore reads and transmits the quantity and total bandwidth that can obtain for reached at the output link of certain object crosspoint;
Step 002: exchange access unit from first object, namely 3# object exchange access unit starts, the number of links of access unit and the speed of each link is exchanged according to this object that can arrive in transmitting, calculate total output bandwidth of this crosspoint, in fig. 11,4# third level crosspoint has 3 output links, the speed setting each bar link is equal, weight is 1, so 4# third level crosspoint can arrive the output bandwidth of object exchange access unit 3# is 1, and the output bandwidth exchanging access unit 4# that achieves the goal is 2;
Step 003:4# third level crosspoint input link has 2, and each bar link rate is equal, is 1.Access unit 3# is exchanged for object, when being so polled to 2 input links, cumulative input bandwidth is 1 respectively, 2, in time being polled to the 1st article of input link, input bandwidth is 1, being less than or equal to achieve the goal exchanges the output bandwidth of access unit 1#, therefore third level crosspoint exchanges the routing iinformation of access unit 3# by completing can to achieve the goal toward the 1st article of output link that input link is corresponding to the second level crosspoint transmission in Central switching frame to the internal bus in first order crosspoint, time input is polled to the 2nd article of input link, add that total input tape of Article 1 input link then two input links is wider than 1, therefore cannot achieve the goal toward the 2nd article of corresponding output link of input link to the second level crosspoint transmission in Central switching frame and exchange the routing iinformation of access unit 3#.
Step 004: exchange access unit for 4# object, when being so polled to 2 input links, cumulative input bandwidth is 1 respectively, 2, in time being polled to the 1st article of input link, input bandwidth is 1, being less than or equal to achieve the goal exchanges the output bandwidth of access unit 4#, can achieve the goal toward the 1st article of corresponding output link of input link to the second level crosspoint transmission in Central switching frame and exchange the routing iinformation of access unit 4#, time input is polled to the 2nd article of input link, add that total input bandwidth of Article 1 input link then two input links equals 2, still the output bandwidth that 4# object exchanges access unit is less than or equal to, therefore can achieve the goal toward the 2nd article of corresponding output link of input link to the second level crosspoint transmission in Central switching frame and exchange the routing iinformation of access unit 4#.
After above-mentioned process, for the 1# second level crosspoint on the machine frame of center and second level crosspoint 2#, have received two output links and can arrive object exchange access unit 4# by third level crosspoint 4#, and only have an output link can arrive object by third level crosspoint 4# and exchange access unit 3#, achieve third level crosspoint 4# consistent with the input output band width that object exchanges access unit 4# to object exchange access unit 3#.
In the present embodiment, third level crosspoint 4# only exchange with object access unit 3# and object exchange access unit 4# totally two objects to exchange access unit interconnected, in actual applications, if there are more objects to exchange access device, repeat above-mentioned steps successively, namely realizing third level crosspoint, to realize input output band width for each switching purpose unit consistent.
Embodiment 3
The present embodiment controls to be illustrated to the link based on second level crosspoint.
The asymmetric scene of second level crosspoint as shown in figure 12, second level crosspoint 2# and third level crosspoint 7#, third level crosspoint 8# respectively has 1 high speed serialization link interconnected, but due to reasons such as link exceptions, a link between second level crosspoint 2# and third level crosspoint 7# disconnects, so crosspoint 2# in the second level only and between third level crosspoint 8# has 1 link interconnected, so through second level crosspoint 2#, access unit 7# can only be exchanged and object exchanges access unit 8# by only having a link can arrive object with third level crosspoint 8#, for this situation, treatment step is as follows:
Step 001: in the second level crosspoint 2# on the machine frame of center, transmitted by topology detection module detection reading and obtain its annexation with machine frame table, index in transmitting is that object exchanges access unit, content is then to arrive link number and this link rate (i.e. bandwidth) that this object exchanges access unit, it is interconnected with which service subrack that machine frame table is used to indicate certain link, its index is business frame number, content be the interconnected correspondence of this business frame input link numbering with and link rate (i.e. bandwidth);
Step 002: second level crosspoint 2# is from object exchanges access unit 7#, according to the link rate of its annexation and each bar link, calculate and arrive the output bandwidth that this object exchanges the destination service subrack at access unit place, equally, if the bandwidth weighting of the input and output link of second level crosspoint 2# is all 1, second level crosspoint 2# can only arrive object by 1 link by third level crosspoint 8# and exchange access unit 3#, and the output bandwidth therefore arriving object exchange access unit 7# in the crosspoint 2# of the second level is 1;
Step 003: from source service subrack 1, obtaining business frame 1 and second level crosspoint 2# according to machine frame table, to have 2 links interconnected, each bar link successively accumulation calculating service subrack 1 arrives the input bandwidth of this object crosspoint 7#, and compare with output bandwidth, when, due to business frame 1 and second level crosspoint #2, to have 2 links interconnected, therefore the corresponding output link to Article 1 link can arrive the routing iinformation of object Fabric Interface 7# to transmitting, passed to the corresponding first order crosspoint 1# of service subrack 1 by internal bus after third level crosspoint 1# in service subrack 1 receives this information, corresponding output link transmission to Article 2 link cannot arrive the routing iinformation of object Fabric Interface 7#, is passed to the first order crosspoint 2# in service subrack 1 after the third level crosspoint 2# in service subrack 1 receives this information by internal bus,
Step 004: when being polled to source service subrack 3, repeat the operation of step 003, achieve equally and can arrive object Fabric Interface 7# to the first order exchange access unit 5#1 bar output link in service subrack 3, the first order exchanges access unit 6#1 bar output link cannot arrive object Fabric Interface 7#;
Step 005: exchange access unit 8# to next object, repeats the operation of step 002 to step 004;
Through the process at crosspoint 2# place, the second level, achieve and only have 1 input link can exchange access unit 8# by 1 link arrival 7# object exchange access unit and object to each business frame of control, achieve the consistent of input link and output link bandwidth, solve local congestion's problem.When there being more object to exchange access unit in system, identical mode can be taked to realize asymmetrical process.
According to foregoing description, can find out, adopt method and apparatus of the present invention, ensure that for each object exchange access unit, the input bandwidth of the second level and third level crosspoint is less than or equal to output bandwidth, solves local congestion's problem, improves the stability of system.
Above-mentioned each module can by the central processing unit (CentralProcessingUnit in electronic equipment, CPU), digital signal processor (DigitalSignalProcessor, DSP) or programmable logic array (Field-ProgrammableGateArray, FPGA) realize.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of hardware embodiment, software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store and optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (8)
1. a chainlink control method, is applied to three-level exchange system, it is characterized in that, the method comprises:
Link information in acquisition system and/or machine frame information;
According to link information and/or the machine frame information of described acquisition, carry out link control.
2. method according to claim 1, is characterized in that, for third level crosspoint,
Link information in described acquisition system and/or machine frame information, comprising:
Obtain the annexation of the input link of described third level crosspoint and the annexation of link rate and output link and link rate;
The described link information according to described acquisition and/or machine frame information, carry out link control, comprising:
Calculate current input tape width values K according to K=K+Ki, wherein, the link rate of the initial value of K to be 0, Ki be described third level crosspoint i-th input link, i=1,2 ..., n, n be the number of described third level crosspoint input link;
Judge whether the value of described K is not more than the total output bandwidth of described third level crosspoint, if, send to the second level crosspoint that described i-th input link is corresponding and can arrive object exchange access unit information, i=i+1, recalculate the value of K, continue to judge whether the value of described K is not more than the total output bandwidth of described third level crosspoint, so circulates; Otherwise, to i-th, the i-th+1 ..., and second level crosspoint corresponding to n-th input link send and can not arrive object and exchange access unit information, wherein, the output bandwidth that described third level crosspoint is total is the link rate sum of all output links of described third level crosspoint.
3. method according to claim 1, is characterized in that, for second level crosspoint,
Link information in described acquisition system and/or machine frame information, comprising:
Obtain the annexation of the input link of described second level crosspoint and link rate, output link annexation and link rate and there is the composition situation of link-attached service subrack with described second level crosspoint;
The described link information according to described acquisition and/or machine frame information, carry out link control, comprising:
The input tape width values Kt from source service subrack t is calculated according to Kt=Kt+Kti, wherein, the initial value of Kt is 0, Kti is the link rate of described second level crosspoint i-th from the input link of source service subrack t, i=1,2 ..., n, t=1,2 ..., m, n be the number of described second level crosspoint from the input link of source service subrack t, m is the number that there is link-attached source service subrack with described second level crosspoint;
Judge whether the value of described Kt is not more than the output bandwidth of described second level crosspoint to the service subrack at object crosspoint h place, if, the information that can arrive object exchange access unit h is sent from the first order crosspoint that the input link of source service subrack t is corresponding to described i-th, i=i+1, recalculate the value of Kt, continue to judge whether the value of described Kt is not more than the output bandwidth of described second level crosspoint to the service subrack at object crosspoint h place, so circulates, otherwise, to i-th, the i-th+1, and n-th sends the information that can not arrive object exchange access unit h from the first order crosspoint that the input link of source service subrack t is corresponding, after traveling through all input links from source service subrack t, t=t+1, i=1, recalculate the value of Kt, continue to judge whether the value of described Kt is not more than the output bandwidth of described second level crosspoint to the service subrack at object crosspoint h place, wherein, described second level crosspoint is the link rate sum of described second level crosspoint to all output links of object crosspoint h to the output bandwidth of the service subrack at object crosspoint h place,
Travel through after all and described second level crosspoint exists link-attached source service subrack, h=h+1, t=1, i=1, repeat above-mentioned steps, carry out link control.
4. according to the method in claim 2 or 3, it is characterized in that the described link information according to acquisition and/or machine frame information are carried out link control, being comprised:
Adopt poll mode and/or when crosspoint output link breaks down, according to obtain link information and/or machine frame information, link control is carried out to described crosspoint.
5. a link data unit, is applied to three-level exchange system, it is characterized in that, this device comprises: acquisition module and link control module; Wherein,
Described acquisition module, for the link information in acquisition system and/or machine frame information;
Described link control module, for according to the link information of described acquisition and/or machine frame information, carries out link control.
6. device according to claim 5, is characterized in that, described link control module comprises the first calculating sub module, first and judges that submodule and first sends submodule; Wherein,
Described acquisition module, specifically for obtaining the annexation of input link of third level crosspoint and the annexation of link rate and output link and link rate;
Described first calculating sub module, for calculating current input tape width values K according to K=K+Ki, wherein, the initial value of K is 0, Ki is the link rate of described third level crosspoint i-th input link, i=1,2 ..., n, n be the number of described third level crosspoint input link; And the notice of submodule is sent according to first, redefine i=i+1, and recalculate the value of K;
Described first judges submodule, for judging whether the value of K that described first calculating sub module calculates is not more than the total output bandwidth of described third level crosspoint, the total output bandwidth of described third level crosspoint is the link rate sum of all output links of described third level crosspoint;
Described first sends submodule, for when first judges that submodule determines that the value of K is not more than the total output bandwidth of described third level crosspoint, send to the second level crosspoint that described i-th input link is corresponding and can arrive object exchange access unit information, afterwards, the first calculating sub module is notified; When first judges that submodule determines that the value of K is greater than the total output bandwidth of described third level crosspoint, to i-th, the i-th+1 ..., and second level crosspoint corresponding to n-th input link send and can not arrive object and exchange access unit information.
7. device according to claim 5, is characterized in that, described link control module comprises the second calculating sub module, second and judges that submodule and second sends submodule; Wherein,
Described acquisition module, specifically for obtain the annexation of the input link of second level crosspoint and link rate, output link annexation and link rate and there is the composition situation of link-attached service subrack with described second level crosspoint;
Described second calculating sub module, for calculating the input tape width values Kt from source service subrack t according to Kt=Kt+Kti, wherein, the initial value of Kt is 0, Kti is the link rate of described second level crosspoint i-th from the input link of source service subrack t, i=1,2 ..., n, t=1,2 ..., m, n is the number of described second level crosspoint from the input link of source service subrack t, and m is the number that there is link-attached source service subrack with described second level crosspoint; And send submodule second and to send to described i-th first order crosspoint corresponding from the input link of source service subrack t and can arrive after object exchanges the information of access unit h, i=i+1, recalculates the value of Kt; And after all input links from source service subrack t of traversal, t=t+1, i=1, recalculate the value of Kt; And after all and described second level crosspoint of traversal exists link-attached source service subrack, h=h+1, t=1, i=1, recalculate the value of Kt;
Described second judges submodule, for judging whether the value of the Kt that described second calculating sub module calculates is not more than the output bandwidth of described second level crosspoint to the service subrack at object crosspoint h place; Wherein, described second level crosspoint is the link rate sum of described second level crosspoint to all output links of object crosspoint h to the output bandwidth of the service subrack at object crosspoint h place;
Described second sends submodule, for when second judges that submodule determines that the value of Kt is not more than described second level crosspoint to the output bandwidth of the service subrack at object crosspoint h place, to send from the first order crosspoint that the input link of source service subrack t is corresponding to described i-th and can arrive the information that object exchanges access unit h; When second judges that submodule determines that the value of Kt is greater than described second level crosspoint to the output bandwidth of the service subrack at object crosspoint h place, to i-th, the i-th+1 ..., and n-th to send from first order crosspoint corresponding to the input link of source service subrack t and can not arrive the information that object exchanges access unit h.
8. the device according to claim 6 or 7, is characterized in that, this device also comprises trigger module,
Described trigger module, for adopting the mode of poll and/or when crosspoint output link breaks down, trigger link control module carries out link control.
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| US15/519,666 US10250506B2 (en) | 2014-10-22 | 2015-04-09 | Link control method and apparatus |
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| CN105577575B (en) | 2019-09-17 |
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| WO2016062024A1 (en) | 2016-04-28 |
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